/Engine/Source/Runtime/NavigationSystem/Public/NavigationSystem.h
void GetOnScreenMessages ( [TMultiMap](API\Runtime\Core\Containers\TMultiMap)< [FCoreDelegates::EOnScreenMessageSeverity](API\Runtime\Core\Misc\FCoreDelegates\EOnScreenMessageSeverity), [FText](API\Runtime\Core\Internationalization\FText) > & OutMessages )